Don't forget to look in the Valley of Virginia. The Ewings, Gillespies, Thompsons, etc. were there by the mid-1700's and they were definitely from Chester, PA/Cecil, MD. There was apparently a group who moved down to SW Virginia from Octorara Hundred. They lived near each other on the New River is what is now Wythe County, VA, which evolved out of Botetourt, Montgomery, Augusta and Fincastle Counties. Many of the early settlers never moved from their original patented land, but the county was divided and subdivided around them. There were Ewings and Gillespies in Tazewell County, VA, also. I believe the Wythe County, VA genealogy site has an online file on the Ewing family. Good luck. PS: My own John Bralley was living with these Ewings, Gillespies, etc. in Octorara Hundred in the 1760's and came to Virginia with them.